/**
*
* Copyright 2008 - 2009
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*
* @project loon
* @author cping
* @email：javachenpeng@yahoo.com
* @version 0.1.1
*/
package loon.utils.collection;
import java.util.ArrayList;
import loon.utils.CollectionUtils;
import loon.utils.MathUtils;
public class ArrayMap {
static final private float LOAD_FACTOR = 0.75f;
private int threshold;
private Entry[] keyTables;
private Entry[] valueTables;
private int size = 0;
public ArrayMap() {
this(CollectionUtils.INITIAL_CAPACITY);
}
public ArrayMap(int initialCapacity) {
if (initialCapacity <= 0) {
initialCapacity = CollectionUtils.INITIAL_CAPACITY;
}
keyTables = new Entry[initialCapacity];
valueTables = new Entry[initialCapacity];
threshold = (int) (initialCapacity * LOAD_FACTOR);
}
public final int size() {
return size;
}
public final boolean isEmpty() {
return size == 0;
}
public final boolean containsValue(Object value) {
return indexOf(value) >= 0;
}
public final int indexOf(Object value) {
if (value != null) {
for (int i = 0; i < size; i++) {
if (value.equals(valueTables[i].value)) {
return i;
}
}
} else {
for (int i = 0; i < size; i++) {
if (valueTables[i].value == null) {
return i;
}
}
}
return -1;
}
public boolean containsKey(final Object key) {
Entry[] table = keyTables;
if (key != null) {
int hashCode = key.hashCode();
int index = (hashCode & 0x7FFFFFFF) % table.length;
for (Entry e = table[index]; e != null; e = e.next) {
if (e.hashCode == hashCode && key.equals(e.key)) {
return true;
}
}
} else {
for (Entry e = table[0]; e != null; e = e.next) {
if (e.key == null) {
return true;
}
}
}
return false;
}
public Object get(final Object key) {
Entry[] table = keyTables;
if (key != null) {
int hashCode = key.hashCode();
int index = (hashCode & 0x7FFFFFFF) % table.length;
for (Entry e = table[index]; e != null; e = e.next) {
if (e.hashCode == hashCode && key.equals(e.key)) {
return e.value;
}
}
} else {
for (Entry e = table[0]; e != null; e = e.next) {
if (e.key == null) {
return e.value;
}
}
}
return null;
}
public Object getValue(final Object key) {
return get(key);
}
public final Object get(final int index) {
if (index < 0 || index >= size) {
return null;
}
Entry entry = getEntry(index);
if (entry != null) {
return entry.value;
}
return null;
}
public final Object getKey(final int index) {
if (index < 0 || index >= size) {
return null;
}
Entry entry = getEntry(index);
if (entry != null) {
return entry.key;
}
return null;
}
public final Entry getEntry(final int index) {
if (index >= size) {
throw new IndexOutOfBoundsException("Index:" + index + ", Size:"
+ size);
}
return valueTables[index];
}
public Object put(final Object key, final Object value) {
int hashCode = 0;
int index = 0;
if (key != null) {
hashCode = key.hashCode();
index = (hashCode & 0x7FFFFFFF) % keyTables.length;
for (Entry e = keyTables[index]; e != null; e = e.next) {
if ((e.hashCode == hashCode) && key.equals(e.key)) {
return swapValue(e, value);
}
}
} else {
for (Entry e = keyTables[0]; e != null; e = e.next) {
if (e.key == null) {
return swapValue(e, value);
}
}
}
ensureCapacity();
index = (hashCode & 0x7FFFFFFF) % keyTables.length;
Entry e = new Entry(hashCode, key, value, keyTables[index]);
keyTables[index] = e;
valueTables[size++] = e;
return null;
}
public final void set(final int index, final Object value) {
getEntry(index).setValue(value);
}
public Object remove(final Object key) {
Entry e = removeMap(key);
if (e != null) {
Object value = e.value;
removeList(indexOf(e));
e.clear();
return value;
}
return null;
}
public final Object remove(int index) {
Entry e = removeList(index);
Object value = e.value;
removeMap(e.key);
e.value = null;
return value;
}
public final void clear() {
int length = keyTables.length;
for (int i = 0; i < length; i++) {
keyTables[i] = null;
valueTables[i] = null;
}
size = 0;
}
public Entry[] toEntrys() {
Entry[] lists = (Entry[]) CollectionUtils.copyOf(valueTables, size);
return lists;
}
public ArrayList<Entry> toList() {
ArrayList<Entry> lists = new ArrayList<ArrayMap.Entry>(size);
for (int i = 0; i < size; i++) {
lists.add(valueTables[i]);
}
return lists;
}
public final Object[] toArray() {
Object[] array = new Object[size];
for (int i = 0; i < size; i++) {
array[i] = get(i);
}
return array;
}
public int hashCode() {
return super.hashCode();
}
public final boolean equals(Object o) {
if (!getClass().isInstance(o)) {
return false;
}
ArrayMap e = (ArrayMap) o;
if (size != e.size) {
return false;
}
for (int i = 0; i < size; i++) {
if (!valueTables[i].equals(e.valueTables[i])) {
return false;
}
}
return true;
}
public Object clone() {
ArrayMap copy = new ArrayMap();
copy.threshold = threshold;
copy.keyTables = keyTables;
copy.valueTables = valueTables;
copy.size = size;
return copy;
}
private final int indexOf(final Entry entry) {
for (int i = 0; i < size; i++) {
if (valueTables[i] == entry) {
return i;
}
}
return -1;
}
private final Entry removeMap(Object key) {
int hashCode = 0;
int index = 0;
if (key != null) {
hashCode = key.hashCode();
index = (hashCode & 0x7FFFFFFF) % keyTables.length;
for (Entry e = keyTables[index], prev = null; e != null; prev = e, e = e.next) {
if ((e.hashCode == hashCode) && key.equals(e.key)) {
if (prev != null) {
prev.next = e.next;
} else {
keyTables[index] = e.next;
}
return e;
}
}
} else {
for (Entry e = keyTables[index], prev = null; e != null; prev = e, e = e.next) {
if ((e.hashCode == hashCode) && e.key == null) {
if (prev != null) {
prev.next = e.next;
} else {
keyTables[index] = e.next;
}
return e;
}
}
}
return null;
}
private final Entry removeList(int index) {
Entry e = valueTables[index];
int numMoved = size - index - 1;
if (numMoved > 0) {
System.arraycopy(valueTables, index + 1, valueTables, index,
numMoved);
}
valueTables[--size] = null;
return e;
}
private final void ensureCapacity() {
if (size >= threshold) {
Entry[] oldTable = valueTables;
int newCapacity = oldTable.length * 2 + 1;
Entry[] newMapTable = new Entry[newCapacity];
Entry[] newListTable = new Entry[newCapacity];
threshold = (int) (newCapacity * LOAD_FACTOR);
System.arraycopy(oldTable, 0, newListTable, 0, size);
for (int i = 0; i < size; i++) {
Entry old = oldTable[i];
int index = (old.hashCode & 0x7FFFFFFF) % newCapacity;
Entry e = old;
old = old.next;
e.next = newMapTable[index];
newMapTable[index] = e;
}
keyTables = newMapTable;
valueTables = newListTable;
}
}
private final Object swapValue(final Entry entry, final Object value) {
Object old = entry.value;
entry.value = value;
return old;
}
public void reverse() {
for (int i = 0, lastIndex = size - 1, n = size / 2; i < n; i++) {
int ii = lastIndex - i;
Entry tempKey = keyTables[i];
keyTables[i] = keyTables[ii];
keyTables[ii] = tempKey;
Entry tempValue = valueTables[i];
valueTables[i] = valueTables[ii];
valueTables[ii] = tempValue;
}
}
public void shuffle() {
for (int i = size - 1; i >= 0; i--) {
int ii = MathUtils.random(i);
Entry tempKey = keyTables[i];
keyTables[i] = keyTables[ii];
keyTables[ii] = tempKey;
Entry tempValue = valueTables[i];
valueTables[i] = valueTables[ii];
valueTables[ii] = tempValue;
}
}
public void truncate(int newSize) {
if (size <= newSize) {
return;
}
for (int i = newSize; i < size; i++) {
keyTables[i] = null;
valueTables[i] = null;
}
size = newSize;
}
public String toString() {
return toString(',');
}
public String toString(char split) {
if (size == 0) {
return "[]";
}
Entry[] values = this.valueTables;
StringBuilder buffer = new StringBuilder(
CollectionUtils.INITIAL_CAPACITY);
buffer.append('[');
for (int i = 0; i < size; i++) {
Object key = values[i].key;
Object value = values[i].value;
buffer.append(key == this ? "(this Map)" : key);
buffer.append('=');
buffer.append(value == this ? "(this Map)" : value);
if (i < size - 1) {
buffer.append(split).append(' ');
}
}
buffer.append(']');
return buffer.toString();
}
public class Entry {
int hashCode;
Object key;
Object value;
Entry next;
public Entry(final int hashCode, final Object key, final Object value,
final Entry next) {
this.hashCode = hashCode;
this.key = key;
this.value = value;
this.next = next;
}
public Object getKey() {
return key;
}
public Object getValue() {
return value;
}
public Object setValue(final Object value) {
Object oldValue = value;
this.value = value;
return oldValue;
}
public void clear() {
key = null;
value = null;
next = null;
}
public boolean equals(final Object o) {
if (this == o) {
return true;
}
Entry e = (Entry) o;
return (key != null ? key.equals(e.key) : e.key == null)
&& (value != null ? value.equals(e.value) : e.value == null);
}
public int hashCode() {
return hashCode;
}
public String toString() {
return key + "=" + value;
}
}
}